A control method for a cement clinker conveyor belt based on demand-side response of electricity

Abstract

The present invention discloses a control method for a cement clinker conveyor belt based on power demand side response, including: S1: Modeling each cement clinker conveyor belt, establishing an aggregated model of the load demand of the cement clinker transportation, and calculating the power consumption load of the cement clinker conveyor belt; S2: When receiving a load regulation instruction, determining whether the cement clinker conveyor belt is in a working state; S3: Controlling the cement clinker conveyor belt according to the obtained power consumption load and the load regulation instruction. By establishing an aggregated model of the load demand of the cement clinker conveyor belt and controlling the belt speed of each cement clinker conveyor belt, the present invention alleviates the contradiction between power supply and demand; combining the local time-varying electricity price in the scheduling control of the cement clinker conveyor belt can save a considerable amount of electricity charges; controlling the switch states of each cement clinker conveyor belt enables the cement clinker conveyor belts not in the working state to participate in the control of power demand side response, improving the stability and accuracy of the power demand side response control.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grids, and particularly to a control method for a cement clinker conveyor belt based on power demand side response. Background Art

[0002] Demand management has gradually become a popular research topic in the power industry, using high-tech forecasting and effective means to convert load into resources for response scheduling; in order to cope with the huge challenges of energy crisis and environmental pollution, many countries have developed smart distribution network technologies to promote the transformation of the oil economy to a carbon economy. With the development of smart distribution and the power market, the role of power supply control in the power market is becoming increasingly important. With the continuous development of smart distribution networks and the power market, the role of demand side response control in the power market is also becoming more and more important. Currently, the general operation mode of the cement clinker conveyor belt is fixed speed and fixed time, and a control system composed of a PLC is used to control the cement clinker conveyor belt; this operation mode only considers the availability and safety of the conveying system, but does not consider the energy efficiency of the system. At the same time, the cement clinker conveyor belt often works regardless of time periods. If the power consumption of the cement clinker conveyor belt is reasonably arranged through time-varying electricity prices in the scheduling control of the cement clinker conveyor belt, the energy consumption of the cement clinker conveyor belt can be greatly reduced. Chinese Patent No. CN201811569240.8 discloses a control method for setting the belt speed of a belt conveyor. This patent sets up an energy consumption mathematical model and a dynamic model, and sets a load-bearing section, a return section, and a tensioning device in the dynamic model to reflect the actual operating conditions and dynamic characteristics of the belt conveyor; then, by establishing a dynamic optimization problem for setting the belt speed value and setting decision variables, the belt speed setting value that can achieve the best energy-saving effect of the conveyor can be obtained while ensuring the dynamic characteristics of the conveyor belt. However, the control method for setting the belt speed of a belt conveyor in Chinese Patent No. CN201811569240.8 does not consider participating in power demand side response control, only considers the energy-saving situation of the conveyor itself, and does not consider the contradiction between power supply and demand in the local power grid. Summary of the Invention

[0003] The present invention is to solve the problem of high energy consumption during the storage and transfer of cement clinker, and provides a control method for a cement clinker conveyor belt based on power demand side response. By establishing an aggregation model of the cement clinker transportation load, obtaining the optimal response parameter values according to the aggregation model of the cement clinker conveyor belt load, and cooperating with the load adjustment command, the belt speed and switch of the conveyor belt are controlled to alleviate the contradiction between power supply and demand, realize the peak shaving demand of the power grid, and improve the power supply stability.

[0004] To solve the above technical problems, the present invention provides a control method for a cement clinker conveyor belt based on demand-side response of electric power, including: S1: Modeling each cement clinker conveyor belt, establishing an aggregation model of the load demand of the cement clinker conveyor belt, and calculating the electricity load of the cement clinker conveyor belt according to the aggregation model of the load demand of the cement clinker conveyor belt.

[0005] S2: When receiving a load regulation instruction, determine whether the cement clinker conveyor belt is in a working state: If the cement clinker conveyor belt is in a working state, obtain its transportation volume and electricity load at the current moment; if the cement clinker conveyor belt is not in a working state, obtain the rated working parameters of the cement clinker conveyor belt.

[0006] S3: Control the cement clinker conveyor belt according to the obtained electricity load and the load regulation instruction.

[0007] Further, obtain the optimal response parameter values of the cement clinker conveyor belt according to the number of conveyor belts, belt speed, and working parameters of the cement clinker conveyor belt, as well as the transportation volume of the cement clinker conveyor belt.

[0008] Further, in step S3, in addition to according to the obtained electricity load and the load regulation instruction, it also includes controlling each cement clinker conveyor belt according to the local time-varying electricity price.

[0009] Further, in step S3, in addition to calculating the electricity load of the cement clinker conveyor belt and the load regulation instruction, it is sent to the controller of the cement clinker conveyor belt to adjust the belt speed and switch state of each cement clinker conveyor belt, so as to enable the cement clinker conveyor belt to participate in the demand-side response of the power system.

[0010] Further, the working parameters in step S2 include the motor power of the cement clinker conveyor belt, the upper and lower limits of the belt speed of the cement clinker conveyor belt, and the upper and lower limits of the transportation volume of the cement clinker conveyor belt.

[0011] Further, the control method further includes data monitoring and execution tracking, monitoring the real-time electricity load of each cement clinker conveyor belt, and recording and tracking the execution situation of the cement clinker conveyor belt participating in the demand-side response of the power system for the need of later data analysis.

[0012] Further, the load regulation instruction includes a notice of rising or falling electricity price.

[0013] Advantages of the present invention: (1) By establishing an aggregation model for the load demand of the cement clinker conveyor belt, calculating the power consumption load of the cement clinker conveyor belt, and controlling the belt speed of each cement clinker conveyor belt, the contradiction between power supply and demand can be alleviated; (2) By combining the local time-varying electricity price in the scheduling control of the cement clinker conveyor belt, a considerable amount of electricity charges can be saved; (3) In the scheduling control of the cement clinker conveyor belt, the switch states of each cement clinker conveyor belt can be controlled, enabling the cement clinker conveyor belts that are not in the working state to participate in the control of the demand side response of electricity, improving the stability and accuracy of the control of the demand side response of electricity. Brief Description of the Drawings

[0014] Figure 1 is a flowchart of a control method for a cement clinker conveyor belt based on the demand side response of electricity according to the present invention. Detailed Embodiment

[0015] Please refer to Figure 1 , Figure 1 is a schematic flow diagram of a control method for a cement clinker conveyor belt based on the demand side response of electricity according to the present invention. A control method for a cement clinker conveyor belt participating in the demand side response of electricity includes the following steps:

[0016] S1: Model each cement clinker conveyor belt, establish an aggregation model for the load demand of the cement clinker transportation, and calculate the power consumption load of each cement clinker conveyor belt according to the aggregation model of the load demand of the cement clinker conveyor belt;

[0017] S2: When a load adjustment instruction is received, determine whether the cement clinker conveyor belt is in the working state: If the cement clinker conveyor belt is in the working state, obtain its transportation volume and power consumption load at the current moment; If the cement clinker conveyor belt is not in the working state, obtain the rated working parameters of the cement clinker conveyor belt, and select a cement clinker conveyor belt with appropriate working parameters to participate in the control of the demand side response of electricity;

[0018] S3: Control the belt speed and switch state of the cement clinker conveyor belt according to the obtained power consumption load and the load adjustment instruction.

[0019] In this embodiment, further obtain the optimal response parameter values of the cement clinker conveyor belt according to the number of conveyor belts, belt speed, and working parameters of the cement clinker conveyor belt, as well as the transportation volume of the cement clinker conveyor belt.

[0020] In this embodiment, in step S3, in addition to according to the obtained power consumption load and the load adjustment instruction, it also includes controlling each cement clinker conveyor belt according to the local time-varying electricity price.

[0021] In this embodiment, in step S3, in addition to calculating the power consumption load of the cement clinker conveyor belt and the load adjustment instruction, they are sent to the controller of the cement clinker conveyor belt to adjust the belt speed and switch state of each cement clinker conveyor belt, so that the cement clinker conveyor belt participates in the demand-side response of the power system.

[0022] In this embodiment, the working parameters in step S2 include the motor power of the cement clinker conveyor belt, the upper and lower limits of the belt speed of the cement clinker conveyor belt, and the upper and lower limits of the transportation volume of the cement clinker conveyor belt.

[0023] In this embodiment, the control method further includes data monitoring and execution tracking, monitoring the real-time power consumption load of each cement clinker conveyor belt, and recording and tracking the execution status of the cement clinker conveyor belt participating in the demand-side response of the power system, which is convenient for the need of later data analysis.

[0024] In this embodiment, the load adjustment instruction includes a notice of rising or falling electricity price.

[0025] In this embodiment, the number of cement clinker conveyor belts is 6.

[0026] Specifically, a control method for a cement clinker conveyor belt based on the demand-side response of electricity calculates the power consumption load of each cement clinker conveyor belt through the aggregated load demand model of the cement clinker conveyor belt. When receiving the load adjustment instruction issued by the power supply side, the power consumption load of the cement clinker conveyor belt that is not in the water-using state is compared with the load to be adjusted in the demand control instruction, so as to control the belt speed and switch state of each cement clinker conveyor belt, enabling the cement clinker conveyor belt that is not in the working state to participate in the demand-side response control of electricity, and improving the accuracy of the demand-side response control of electricity.

[0027] In step S1, first, each cement clinker conveyor belt is modeled to generate an aggregated model of the load demand of the cement clinker conveyor belt. In order to make full use of the demand-side dispatchable resource of the cement clinker conveyor belt, enable it to effectively participate in DR control, provide services for the power grid, and improve the power quality, the present invention models the cement clinker conveyor belt to form an aggregated model of the load demand of the cement clinker conveyor belt, taking into account the belt speed and transportation volume of the cement clinker conveyor belt, and reasonably controlling the belt speed and switch state of the cement clinker conveyor belt to change the belt speed and transportation volume of the cement clinker conveyor belt to improve the energy consumption situation.

[0028] The cement clinker conveyor belt uses electricity as energy and is a continuous transportation machine with a conveyor belt serving as both the traction mechanism and the load-bearing mechanism. The power of the cement clinker conveyor belt is:

[0029]

[0030] Where: p(v, T) is the power of the cement clinker conveyor belt (kW); v is the belt speed (m / s); T is the conveyor throughput (t / h); the coefficients θ1 - θ4 are obtained by calculating the parameters of the cement clinker conveyor belt design, and can also be obtained through parameter identification or curve fitting, etc.

[0031] The energy cost of the cement clinker conveyor belt within the time domain [t0, t n is expressed as:

[0032]

[0033] Among them, i represents the conveyor, i = (1, 2, 3,..., 6); P t (t) is the electricity price at time t, T(t) is the throughput at time t, t / h.

[0034] To ensure the transportation safety during the transportation process, the stock in the cement clinker silo, the throughput of the cement clinker conveyor belt, and the belt speed are restricted:

[0035] Regarding the restriction on the throughput of the cement clinker conveyor belt, the stock in the cement clinker silo is denoted as G, and there are the following relationships:

[0036] L T ≤S k ≤H T

[0037] Wherein, S k is the stock of cement clinker at the k - th sampling moment, L T is the lower limit value, H T is the upper limit value.

[0038] Regarding the restriction on the throughput and belt speed of the cement clinker conveyor belt:

[0039]

[0040] T min ≤T k ≤T max (k = 1,..., f)

[0041] Where is the belt speed of the i - th cement clinker conveyor belt at the k - th sampling moment, V min(i) is the minimum belt speed of the i - th cement clinker conveyor belt, V max(i) the maximum belt speed of the i - th cement clinker conveyor belt, T min is the minimum throughput of the cement clinker conveyor belt, T k is the throughput of the cement clinker conveyor belt at the k - th sampling moment, T max is the maximum throughput of the cement clinker conveyor belt.

[0042] According to the limitations of the transportation volume and belt speed of the cement clinker silo and the cement clinker conveyor belt, the objective function is obtained:

[0043]

[0044] In the formula, t s is the sampling time; is the weight coefficient to balance the importance of the energy cost and the belt speed inhibition term; is the belt speed at the first sampling period of the current optimization time domain; is the belt speed at the last sampling period of the previous optimization time domain; is the power (kW) of the i-th cement clinker conveyor belt at the k-th sampling moment, is the optimal control instruction.

[0045] Therefore, according to the aggregation model of the load demand of the cement clinker conveyor belt, the relevant parameters of each cement clinker conveyor belt are collected, the electricity load of each cement clinker conveyor belt is calculated, that is, whether it is turned on or in a working state at the current moment, and the energy cost C. The energy cost and the belt speed deviation are included in the objective function. By minimizing it, the optimal control instruction of the cement clinker conveyor belt can be obtained

[0046] When a load regulation instruction is received, the load regulation instruction includes a notice of an increase or decrease in the electricity price. It is judged whether the cement clinker conveyor belt is in a working state: if the cement clinker conveyor belt is in a working state, its transportation volume and electricity load at the current moment are obtained; the belt speed and transportation volume of the belt conveyor are matched and controlled according to the optimal response parameter value, and at the same time, in cooperation with the local time-varying electricity price, the demand-side response control of the cement clinker conveyor belt is carried out.

[0047] Data monitoring and execution tracking: Monitor the real-time electricity load of each cement clinker conveyor belt, record and track the execution situation of the cement clinker conveyor belt participating in the demand-side response of the power system for the need of later data analysis.

[0048] The above embodiments are only a preferred solution of the present invention, and do not impose any form of limitation on the present invention. There are other variants and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A control method for a cement clinker conveyor belt based on demand-side response of electric power, characterized in that, It includes the following steps: S1: Model each clinker conveyor belt to establish an aggregated model of the clinker conveyor belt load demand. According to the aggregated model of the clinker conveyor belt load demand, calculate the power consumption load and energy cost of the clinker conveyor belt. Include the energy cost and belt speed deviation in the objective function, and by minimizing it, obtain the optimal control instruction for the clinker conveyor belt. The belt speed deviation includes the square of the change in the belt speed from the last sampling period of the previous optimization time domain to the first sampling period of the current optimization time domain, and the square of the change in the belt speed from the (k + 1)-th sampling moment to the k-th sampling moment; S2: When receiving a load regulation instruction, determine whether the clinker conveyor belt is in a working state: If the clinker conveyor belt is in a working state, obtain its current transportation volume and power consumption load; If the clinker conveyor belt is not in a working state, obtain the rated working parameters of the clinker conveyor belt; S3: Control the clinker conveyor belt according to the obtained power consumption load and the load regulation instruction.

2. The control method for a cement clinker conveyor belt based on demand-side response of electric power according to claim 1, characterized in that, Further, according to the number of conveyor belts, belt speed, and working parameters of the clinker conveyor belt, as well as the transportation volume of the clinker conveyor belt, obtain the optimal response parameter values of the clinker conveyor belt.

3. The control method for a cement clinker conveyor belt based on demand-side response of electric power according to claim 2, characterized in that, In step S3, in addition to according to the obtained power consumption load and the load regulation instruction, it also includes controlling each clinker conveyor belt according to the local time-varying electricity price.

4. The control method for a cement clinker conveyor belt based on demand-side response of electric power according to claim 1, characterized in that, In S3, in addition to according to the calculated power consumption load of the clinker conveyor belt and the load regulation instruction, send them to the controller of the clinker conveyor belt, and adjust the belt speed and switch state of each clinker conveyor belt to enable the clinker conveyor belt to participate in the demand-side response of the power system.

5. The control method for a cement clinker conveyor belt based on demand-side response of electric power according to claim 3, characterized in that, The working parameters in S2 include the motor power of the clinker conveyor belt, the upper and lower limits of the belt speed of the clinker conveyor belt, and the upper and lower limits of the transportation volume of the clinker conveyor belt.

6. The control method for a cement clinker conveyor belt based on demand-side response of electric power according to claim 4, characterized in that, The control method also includes data monitoring and execution tracking, monitoring the real-time power consumption load of each clinker conveyor belt, and recording and tracking the execution situation of the clinker conveyor belt participating in the demand-side response of the power system for the need of later data analysis.

7. The control method for a cement clinker conveyor belt based on demand-side response of electric power according to claim 1, characterized in that, The load regulation instruction includes a notice of rising or falling electricity price.

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